POACEAE 133 



Spikes stout, the spikelets at right-angles to the rachis : second scale with a row of 



glands each side of the midnerve. 1. C. aromaticus. 



Spikes slender, the spikelets diverging from the rachis : second scale without 



glands. 2. C. Chapadensis. 



1. Campulosus aromaticus (Walt.) Scribn. Stems 9-12 dm. tall, erect : leaf -blades 

 1.5dm. long or less, 2-4 mm. wide, flat or involute : spikes 5-10 cm. long : spikelets about 

 6 ram. long. Plant pungent to the taste. [Ctenium Americanum Spreng.] 



In moist soil in pine lands, Virginia to Florida and Mississippi. Summer and fall. 



2. Campulosus Chapadeiisis Trin. Stems slender, 6-10 dm. tall : leaf-blades flat, 

 2 dm. long or less, 1-3 mm. wide : spikes slender, 5-15 cm. long : spikelets 5-6 mm. long, 

 exclusive of the awns. 



In pine woods, Florida. Also in Brazil. Summer and fall. 



78. CHLORIS Sw. 



Usually perennial grasses, with flat leaf-blades and spicate inflorescence, the spikes ver- 

 ticillate or approximate. Spikelets 1-flowered, sessile, crowded in 2 rows, the rachilla 

 prolonged beyond the flower. Scales usually 4, sometimes 5, or occasionally more, the 2 

 lower empty, persistent, unequal, keeled, narrow, acute or acuminate, awnless or rarely 

 awn-pointed, the third scale acute, usually long awned, rarely nearly awnless, enclosing a 

 perfect flower and a folded 2-keeled palet, the remaining scale or scales commonly empty 

 and usually awned. Stamens 3. Styles distinct. Stigmas plumose. 



Spikes slender, usually naked at the base or with a few scattered spikelets. 



Midnerve of the thiid scale not pilose, but hispidulous above the middle. 1. C. Neallcyi. 



Nerves of the third scale all pilose. 



Apex of the elliptic fourth scale acute. 2. C. tenuispica. 



Apex of the obovate-cuneate fourth scale obliquely truncate. 3. C. verticittata. 



Spikes stout, spikelet-bearing to the base. 



Hairs on the nerves of the third scale short, 0.5 mm. long or less, not manifest, nor 



extending beyond the apex of the scale. 

 Fourth scale obovate-cuneate, 3-nerved, 0.6 mm. wide, the apex unequally 



rounded. 4. C. breyfspica. 



Fourth scale obcuneate or triangular, 5-nerved, 1 mm. broad or a little more. 5. C. la'isquamea. 

 Fourth scale broadly triangular, 7-nerved, wider than long. 6. C. cu ullata. 



Hairs on the lateral nerves of the third scale long, 1 mm. long or more, manifest 



and decidedly extending beyond the apex of the scale. 

 Scales 6 : hairs on the lateral nerves of the third scale about equal in length. 

 Hairs exceeding the apex of the scale, about 1 mm. long : fourth scale 1 mm. 



wide : upier surface of the leaves glabrous. 7. C. Texana. 



Hairs much exceeding the apex of the scale, 2-3 mm. long: fourth scale 0.5 



mm . wide : upper surface of the leaves near the base visually long-hairy. 8. C. barbata. 

 Scales 7-9, the upper ones much reduced ; hairs on the lateral nerves of the 



third scale unequal in length, those at the summit much longer. 9. C. Prieuri. 



1. Chloris Nealleyi Nash. Stems 3-6 dm. tall : leaf -blades 2.5-15 cm. long, 3-5 

 mm. wide, rough above : spikes 5-8, 10-18 cm. long : spikelets, exclusive of the awns, 

 about 4 mm. long : scales 4 ; outer empty scales acuminate ; third scale, exclusive of the 

 awn r 4mm. long, in side view equilateral and 0.8 mm. wide, acute, the internerves rough, 

 the lateral nerves pilose above the middle, the awn 6-9 mm. long ; fourth scale 2-2.5 mm. 

 long, in side view elliptic and about 0.5 mm. wide, the apex acute, the awn 4-5 mm. long. 



In dry soil, Texas. Summer. 



2. Chloris tenuispica Nash. Stems 2-4 dm. tall : leaf-blades 4-15 cm. long, 2-3 

 mm. wide, abruptly acute, rough above and on the margins : axis of the inflorescence 2 

 cm. long or less : spikes 10-12, 6-10 cm. long, spreading, very slender, in about 2 whorls : 

 spikelets, exclusive of the awns, about 3 mm. long : scales 4 or 5 ; outer empty ones nar- 

 row, acuminate, awn-pointed ; third scale about 3 mm. long, in side view elliptic and 0.7 

 mm. wide, the nerves pilose, the awn 4-6 mm. long ; fourth scale nearly glabrous, smaller 

 than the third, 1.75-2 mm. long, acute at the apex, the awn 2.5-4 mm. long ; fifth scale 

 smaller. 



In dry soil, Texas. Summer. 



3. Chloris verticillata Nutt. Stems 2-5 dm. tall : leaf -blades 1.5-18 cm. long, 2-4 

 mm. broad, rough above and on the margins, obtuse : axis of the inflorescence 0.5-5 cm. 

 long : spikes 8-21, spreading, 5-15 cm. long, in 1-4 whorls, or the upper ones scattered or 

 approximate : spikelets, exclusive of the awns, about 3 mm. long : scales 4 ; outer empty 

 ones acuminate, awn-pointed ; third scale 2.5-2.75 mm. long, in side view nearly equi- 

 lateral and 0.8 mm. wide, the nerves pilose, the awn 5-8 mm. long ; fourth scale 1.5-2 mm. 

 long, in side view obovate-cuneate and about 0.75 mm. wide, the apex obliquely truncate, 

 the awn 4-5 mm. long. 



In sandy soil, Arkansas to Kansas and Texas. Summer. 



